
/* Copyright (c) Mark J. Kilgard, 1997. */

/* This program is freely distributable without licensing fees  and is
   provided without guarantee or warrantee expressed or  implied. This
   program is -not- in the public domain. */

#ifndef __TEXFONT_H__
#define __TEXFONT_H__

#ifdef __APPLE__
    #include <OpenGL/gl.h>
#else
    #include <GL/gl.h>
#endif


#define TXF_FORMAT_BYTE		0
#define TXF_FORMAT_BITMAP	1


typedef struct {
  unsigned short c;       /* Potentially support 16-bit glyphs. */
  unsigned char width;
  unsigned char height;
  signed char xoffset;
  signed char yoffset;
  signed char advance;
  char dummy;           /* Space holder for alignment reasons. */
  short x;
  short y;
} TexGlyphInfo;


typedef struct {
  GLfloat min_s;
  GLfloat min_t;
  GLfloat max_s;
  GLfloat max_t;

  GLshort v0[2];
  GLshort v1[2];
  GLshort v2[2];
  GLshort v3[2];

  GLfloat advance;
} TexGlyphVertexInfo;


typedef struct {
  GLuint tex_id;
  int tex_width;
  int tex_height;
  int max_ascent;
  int max_descent;
  int num_glyphs;
  int min_glyph;
  int range;

  unsigned char* tex_image;
  TexGlyphInfo* tgi;
  TexGlyphVertexInfo* tgvi;
  TexGlyphVertexInfo** lut;
} TexFont;


#ifdef __cplusplus
extern "C" {
#endif


extern char* txfErrorString(void);
extern TexFont *txfLoadFont( const char* filename );
extern void txfUnloadFont( TexFont* txf ); 

extern GLuint txfEstablishTexture( TexFont* txf, GLuint tex_id,
                                   GLboolean mipmap, GLenum magf, GLenum minf );
extern void txfBindFontTexture( TexFont* txf );

extern void txfGetStringMetrics( TexFont* txf, char* string, int len,
                                 int* width, int* max_ascent, int* max_descent);

extern void txfRenderGlyph( TexFont* txf, int c );
extern void txfRenderString( TexFont* txf, const char *string, int len );
extern void txfRenderFancyString( TexFont* txf, const char *string, int len );


#ifdef __cplusplus
}
#endif


#endif /* __TEXFONT_H__ */
